This has been addressed (back in January!) and a solution provided here: Clicks and Pops from PWM - #5 by slimechildaudio
The issue has already been reported: **SOLUTION** Fundamental VCO Pops and Clicks from PWM · Issue #140 · VCVRack/Fundamental · GitHub but as yet no fix commit has been made…
Bruce pointed out here: Clicks and Pops from PWM - #2 by Squinky that this was first reported back in August 2020!